Well, I'll put it like this, I want it, but I don't know what they will do it story-line wise. Unless they come up with something relevent or really good, it will just feel crammed and it won't be a good game.

i think the story should be that glados makes an aperture version of the gravity gun and tests with that and portals. co-op could be player 1 with the portal gun and player 2 with the gravity gun. after all black mesa and aperture are rivals so why not try to improve on their idea and one up them?

no. the singleplayer had a good ending and the co-op was just kinda random, so it would be like the forth Indiana Jones or the fourth Pirates of the Carribean. however that isn't to say it shoulden't be a trilogy. maby we can hope for something like the arkhym games. with that it was Arkhym Asylum, then Arkhym City, and now there's Arkhym Origins. maby like the first game's Portal Prelude mod pack but mathcing the Lab Rat timeline. Or Valve can make the game that this one was going to be. a prequel of you (Mell) against Cave Jhonson and his robot army using F-Stop to fight them. or not.

i think the story should be that glados makes an aperture version of the gravity gun and tests with that and portals. co-op could be player 1 with the portal gun and player 2 with the gravity gun. after all black mesa and aperture are rivals so why not try to improve on their idea and one up them?

I think the gravity gun was made by Aperture and stolen by Black Mesa because on a table in Lab Rat (the comic) there is an Aperture-ish looking Grav. Gun. and Cave did say "...or maby you've used one of the many products that we invented, and that other people have somehow managed to steal from us. Black Mesa can eat my bankrupt-" before being interupted by Caroline.

i think the story should be that glados makes an aperture version of the gravity gun and tests with that and portals. co-op could be player 1 with the portal gun and player 2 with the gravity gun. after all black mesa and aperture are rivals so why not try to improve on their idea and one up them?

I think the gravity gun was made by Aperture and stolen by Black Mesa because on a table in Lab Rat (the comic) there is an Aperture-ish looking Grav. Gun. and Cave did say "...or maby you've used one of the many products that we invented, and that other people have somehow managed to steal from us. Black Mesa can eat my bankrupt-" before being interupted by Caroline.